Concrete-mixer.



N9. 886,434. PATENTED'MAY 5, 1908.

. J. H. STEWART.

CONCRETE MIXER.

APPLICATION IILED JAN. 25, 1907.

a SHEETS-SHEET 1. 7. f

INVENTOR Job St art,

No. 886,434. PATENTED MAY 5, 1908.

J. H. STEWART.

CONCRETE MIXER.

APPLICATION FILED JAILZS, 1907.

s SHEETSSHBET 2.

WITNESSES: IN VENTOR J0]??? J Stewart,

No. 886,434.- PATENTED MAY 5, 1908. J. H. STEWART.

CONCRETE MIXER.

APPLICATION FILED JAN. 25, 1907.

3 SHEEN-SHEET -3.

4 I-IIIIHIIIHH WITNESSES.- INVENTUR fl Wm John-61f. Stewart,

w vf By ATTORN{5Y7' UNITED STAT ES g onrronf JOHN H. STEWART, OF WATERLOO, IOWA.

CONCRETE-MIXER.

To all whom it may concern:

{-Be it known that I, JOHN H. STEWART, a citizen of the United States of America, and a resident of l/Vaterloo, Blackhawk county, Iowa, have invented certain new and useful Improvements in Concrete-Mixers, of which the following is a specification.

' My invention relates to improvements in proved concrete-mixer, Fig. 2, is a medial vertical section of the mixing-drum displaying its interior arrangement on one side of a vertical plane through its axis. F 3 is a similar view on the opposite side, Fig. 4 is a plan view of the complete machine, part of the mixing-drum being shown as broken away to better disclose the oppositely disposed mixing-blades secured to its inner 'periphery, and Fig. 5 is a side elevation of said machine.

Similar characters of reference refer to similar parts throughout the several views.

My improved mixing-drum is in the shape of a hollowsphere, composed of two hemispheres o and 8, preferably made of cast iron for the sake of greater strength and cheapness. The front section a has a raised ring or flange 9 provided on its front face with gear teeth 1), and with countersunk holes for the reception of the rivets c. The rear section 5 also has a raised flange a; withv holes registering with the holes in'the flange (1, saidflanges being bv said rivets 1) thus secured together. The front section has a delivery spout r, while the rear section s has a receiving opening The flange 9' projects with smooth faces a slight distance beyond the teeth 1) radially, for a purpose to be presontly described. Within said mixing-drum and placed directly opposite from each otherso that their blades are directed toward the center, are two mixing-blades t and 11, having f anges ll) and 11 respectively which are riveted to the inner periphery of said drum by Specification of Letters Patent; Application filed January 25, 1907; Serial No. 363,940-

wheels e.

Patented May 6, 1908;

means of the rivets 12. Therear end; of the blade t is uppermosawhile the forward end of the blade u is uppermost, this arrangement resulting in. the planes of said blades-crossing eacl'rother at an angle as desired, usuallyf between 30 and 45 degrees.

I have devised a novel form of: supporting I ring for said mixing-drum, saidring being .formed 'of two arallelv flat rings I2 and :c, which; are spaced apart meansof spacing plates f of somewhat narrower width. The said rings are secured together bymeans of bolts 8 passing well as the'said spacing-plates. .The ends of said s acing-plates. f are separated a suflicient istance apart to admit of anti-friction wheels 0 being placed therebetween, said wheels being pivotedon short shafts 9 set across and into the rings b and a: so that the bearing edges of the Wheels are a short dis-' tance inside the inside edges of said y 's. The smooth edges of the flange q enters t e inner space between the rings b and at, so as through both of the rings as to contact with the edges of the anti-friction I The mixing drum is thus 'su ported by said rings, and free to rotate eas' yupon the anti-friction wheels e. Only four wheels e are shown, but as many or few ma be used as desired- A trunnion z exten s outwardly from each'side of the bearing-ring above described and into a bearing, 3 and 4,

on each of the supporting framesc and d.

An arm 9 projects outward and downward from the right hand side of the bearing-ring,

and has at its lower end an extension at right angles furnished with a bearing opening for 1 the outer end of the shaft 1]. A projection 6 extends forward from the same side of said bearing ring, and has a bearing for the front end. of said shaft g The inner end of the shaft '3 is provided with a bevel-gear-Wheel 0, adapted to intermesh with the teeth 10 on the ring (1. A parallel shaft to y is the shaft k, which is set in bearings 4 and 5 on the su port (L This shaft is is driven by means 0 a belt-wheel i allixed thereto and has a gearwheel m inter'meshing with a gear-wheel l on the shaft 7 A- hand-lever h is secured to one side of the ring I), and is used to oscillate the supporting ring and thereby tilt the drum so as to either raise or lower the spout 1" thereof. A hopper '3 has its lower deliveryend inserted into the receiving opening a of said mixii'ig-drum, said hopper being su ported by means of a bracket 1 extending iorizontally backward from the ring as, said bracket having a brace l3 afiixed at its lower end to the same ring x.

hen the belt-wheel t is set in rotation,

the mixing-drum is rotated thereby through the medium'of the gear-wheels m, Z and 0 and the geared ring g. The contents of said mixing-drum, when sufficiently mixed, may be ejected through the spout 1", by tilting said drum with the lever Having described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

and having a pivotal relation to said sseaee standard, segmental spacing-plates secured between said rings, anti-friction rollers mounted between the ends of adjacent spacing-plates with which said first named ring is adapted to contact, and means for rotating said drum.

2. A concrete mixer comprising two hemispherical drum portions provided with joining flanges, one of said flanges being extended to form a peripheral bearing, a tiltable grooved supporting ring surrounding said bearing, and means for rotating said drum.

, Signed at Waterloo, Iowa, this 4th day of Jan. 1907; I

JOHN H. STEWART.

Witnesses 0. D. YOUNG, G. G. KENNEDY. 

